He invented a curious monochord, which was not less accurate than his clocks in the mensuration of time.
"Men of Invention and Industry" by Samuel Smiles
Associated Words: polychord, monochord.
"Putnam's Word Book" by Louis A. Flemming
After the tenth century the development of the monochord seems to have begun in earnest.
"For Every Music Lover" by Aubertine Woodward Moore
In the eleventh century, when musical notation came into being, a monochord was used to teach singing.
"Chats on Household Curios" by Fred W. Burgess
The monochord originally was used much as we use a tuning fork, to determine true musical pitch.
"How to Appreciate Music" by Gustav Kobbé